Radio beceiviltgr apparatus



Nov. 5, 1929. H. D. BARTLETT 1,734,553

' RADIO RECEIVING APPARATUS Filed June 21. 1926 5 l Z5 T A2;

I NV EN TOR.

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l atented Nov. 5 1922 rarest oFFIcE HARRY D. BARTLETT, OF DELAVAN, WISCONSIN RADIO RECEIVING APPARATUS Application filed June 21,

This invention relates to control mechanism and logs for radio receiving sets and has for one of its objects to provide apparatus of this character which will be simple in con- 5 struction, comparatively inexpensive to manufacture and more eflicientin use than those which have been heretofore proposed.

A further object of the invention is to provide a control mechanism for radio receiving 19 sets which is adapted to faciltate the setting f the control instruments.

A still further object of the invention is to provide a simple and effective means whereby the various wave lengths employed is by the broad casting stations may be effec tively logged.

With the above and other objects in view which will appear as the description proceeds, the invention consists in the novel details of 20 construction and combinations and arrangements of parts more fully hereinafter de scribed and particularly pointed out in the ppended claims.

Referring to the accompanying drawings 25 in which like reference characters designate like parts in all the views;

Fig. 1 is a top plan View of a radio receiving set, partially broken away, with the control mechanism and log constituting the pres- 39 cut invention, applied thereto;

F i g. 2 is a vertical sectional view taken approximately on the plane indicated by the line 2-2 of Fig. 1;

Fig. 3 is an end elevational view partly in section, of the parts shown in Figs. 1 and 2; Fig. A is a detail ho izontal sectional view of the reciprocating actuatin member; and

Fig. 5 is an enlarged detail sectional view showing one of the adjusting means for the connections between the reciprocating actuating member and the control mechanism.

Referring more especially to the said d 'awings the numeral indicates generally, a cabinet of any suitable construction within which is mounted the usual instruments which make up a radio receiving set. As is well known in the art, these sets usually include one or more variable condensers 11, having an operating shaft 12 which carries an indicating dial 18 and which may be provided 1926. Serial No. 117,429.

with a suitable vernier mechanism comprising a shaft 15 provided with an operating knob 16.

In the present instance the cabinet 10 is provided with a forward extension 17 which serves to house the shaft 15 and also the portions of the actuating mechanism constituting the present invention.

As here shown, this actuating mechanism comprises a slide member 18 mounted for reciprocation in a dove tail slot or groove 19 provided in the top wall 20 of the extension 17, which slide member is preferably provided with a knob or handle 21 by means of which it may be readily moved back and forth in the said slot or groove. A belt or cord 22 has its opposite ends connected to the opposite ends of the slide member 18 as will be clear from Figs. 1, 2 and 4, and passes around the adj ustably mounted pulleys or sheaves 23 carried by the end walls of the cabinet eX- tension 17. The said cord or belt 22 also passes completely around a wheel or pulley 24L rigidly mounted on the vernicr shaft 15 so that any movement of the slide member 18 in either direction will be transmitted through the cord or belt 22 to the wheel or pulley 24L and then to the shaft 15 whereby the motion of the slide member 18 will be transmitted to the variable condenser 11 as will be readily understood.

As is usual in this type of apparatus the Vernier mechanism provides for a reduction in speed of the motion of the condenser dial 13 and since the operating means 18 and 22 is connected to this Vernier mechanism it follows that the motion of the slide member 18 which is transmitted to the dial 13 will be greatly reduced. As a result the markings or gradations upon the indicator which is associated with the slide member 18 may be spaced further apart with the result that more accurate settings of the condenser may be accomplished, as will appear more fully below.

The upper surface of the top wall 20 of the cabinet extension 17 is provided with a rectangular recess 25 which is adapted to receive a paper or other strip 26 which is preferably ruled and provided with suitable indicia 27 substantially as shown. The rulings and the indicating characters although spaced further apart correspond substantially to the markings 28 of the condenser dial 13 so that when the pointer member 29 of the slide 18 is opposite any particular marking on the paper slip 26, it will indicate a similar setting of the condenser dial 13 as will be readily apparent.

The paper strip 26 just described is preferably mounted in front of the dove tail groove or slot 19 in a top wall 20 of the cabinet extension; and between the said slot or groove and the main body portion of the cabinet 10 there is preferably provided a second recess 3O which is adapted to receive a strip of paper or other material 31 upon which is printed the Wave lengths of the variozus broad casting stations. The said strip 31 is adjustable in and readily removable from its recess and by shifting it therein when a. particular station is found, it is possible to correlate the wave lengths indicated thereon with the settings of the variable condenser 11 as indicated upon the strip 26 and thereby log the various stations in the Well known manner. It will, of course, be understood that the operator will then enter upon the paper strip 26 opposite the various wave lengths, the data relating to the particular station or stations operating upon such wave lengths.

. It will also be understood that the strips 26 and 31 may be readily removed and others having different indicia printed thereon, substituted therefor, so as to accommodate the device to a wide range of receiving apparatus and broad casting wave lengths.

In case the position of the slide member does not correspond with the figures on the indicating dial, the slide member can be held in position while the knob 16 is turned to adjust .the dial to correspond with the slide, the slipping of the cord or belt on the pulley 24E permittingsaid independent movement of the parts. Furthermore, the slide may be quick- 1y moved to the approximate station setting and the knob may then be turned to provide the. fine vernier adjustment. The milled nuts 23 threaded on the projecting studs 23 of the pulleys 23 provide for the easy adjustment of the cord or belt 22.

lVhile one form of the invention has been illustrated and described, it is obvious that those skilled in the art may vary the details of construction as Well as the precise arrangements of parts. without departing from the spirit of the invention, and therefore it. is not. wished to be limited to the above disclosure except as may be required by the claims.

What is claimed is:

1. In a radio receiving apparatus, a cabinet; a variable condenser mounted in said cabinet; a speed reducing vernier mechanism for moving said condenser; a horizontally reciprocable slide member mounted on said. cabinet; and flexible connections between said slide member and said vernier mechanism for transmitting motion from the former to the latter.

2. In a radioreceiving apparatus, a cabinet having an'elongated groove; a variable condenser mounted in said cabinet; a vernier mechanism including a shaft for moving said condenser; a reciprocable slide member mounted in said groove; a wheel carried by said shaft; a belt connected to said slide member and passing around said Wheel; and means for adj ustably controlling the tension of said belt.

3. In a radio receiving apparatus, a con trol instrument having a member provided with grad-nations; means for movingsaid control instrument including a reciprocatory member having an indicator, and connections between said member and instrument and a graduated member cooperatively associated with said reciprocatory member and indicator, the graduation on said last named member corresponding to and being spaced further apart than those upon said instrument member.

In testimony whereof, I afiix my signature.

HARRY I). BARTLETT. 

